6d6bc2a8b4
This is extracted out of eb8f973646476b4a4926ba644a77e2b3a5772159 and includes some additional changes to remove all references to AppBuilder and fix examples that still used App::build() instead of App::new(). In addition I didn't extract the sub app feature as it isn't ready yet. You can use `git diff --diff-filter=M eb8f973646476b4a4926ba644a77e2b3a5772159` to find all differences in this PR. The `--diff-filtered=M` filters all files added in the original commit but not in this commit away. Co-Authored-By: Carter Anderson <mcanders1@gmail.com>
27 lines
860 B
Rust
27 lines
860 B
Rust
use anyhow::Result;
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use bevy::prelude::*;
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fn main() {
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App::new()
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.insert_resource(Message("42".to_string()))
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.add_system(parse_message_system.system().chain(handler_system.system()))
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.run();
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}
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struct Message(String);
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// this system produces a Result<usize> output by trying to parse the Message resource
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fn parse_message_system(message: Res<Message>) -> Result<usize> {
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Ok(message.0.parse::<usize>()?)
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}
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// This system takes a Result<usize> input and either prints the parsed value or the error message
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// Try changing the Message resource to something that isn't an integer. You should see the error
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// message printed.
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fn handler_system(In(result): In<Result<usize>>) {
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match result {
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Ok(value) => println!("parsed message: {}", value),
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Err(err) => println!("encountered an error: {:?}", err),
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}
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}
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